I create a pdf reader using Itextsharp in C#.net windows application, and open successfully pdf file in the Richtextbox but this file open not in a actual file data these are open into other language like that compiler language or any other format.

out put isi open a pdf file which text is abhishek tyagibut the file open is text is (JVBERi0xLjQKJeLjz9MKMiAwIG9iago8PC9MZW5ndGggODMvRmlsdGVyL0ZsYXRlRGVjb2RlPj5zdHJlYW0KeJwzUDBU0DVUMFAwtTQFksm5XIVcTiFcxmYKpqaWCiEpXAZAaQsQQ9/NUMHQSCEkjUsjMSkjszgjNVuhpDIxPVMzJAuoygCkxjWEK5ALAO+3E1EKZW5kc3RyZWFtCmVuZG9iago0IDAgb2JqCjw8L1R5cGUvUGFnZS9NZWRpYUJveFswIDAgNTk1IDg0Ml0vUmVzb3VyY2VzPDwvUHJvY1NldCBbL1BERiAvVGV4dCAvSW1hZ2VCIC9JbWFnZUMgL0ltYWdlSV0vRm9udDw8L0YxIDEgMCBSPj4+Pi9Sb3RhdGUgOTAvQ29udGVudHMgMiAwIFIvUGFyZW50IDMgMCBSPj4KZW5kb2JqCjEgMCBvYmoKPDwvVHlwZS9Gb250L1N1YnR5cGUvVHlwZTEvQmFzZUZvbnQvSGVsdmV0aWNhL0VuY29kaW5nL1dpbkFuc2lFbmNvZGluZz4+CmVuZG9iagozIDAgb2JqCjw8L1R5cGUvUGFnZXMvQ291bnQgMS9LaWRzWzQgMCBSXS9JVFhUKDUuMS4yKT4+CmVuZG9iago1IDAgb2JqCjw8L1R5cGUvQ2F0YWxvZy9QYWdlcyAzIDAgUj4+CmVuZG9iago2IDAgb2JqCjw8L1Byb2R1Y2VyKGlUZXh0U2hhcnAgNS4xLjIgXChjXCkgMVQzWFQgQlZCQSkvQ3JlYXRpb25EYXRlKEQ6MjAxMTExMjUwNzA4MDItMDgnMDAnKS9Nb2REYXRlKEQ6MjAxMTExMjUwNzA4MDItMDgnMDAnKT4+CmVuZG9iagp4cmVmCjAgNwowMDAwMDAwMDAwIDY1NTM1IGYgCjAwMDAwMDAzMzEgMDAwMDAgbiAKMDAwMDAwMDAxNSAwMDAwMCBuIAowMDAwMDAwNDE5IDAwMDAwIG4gCjAwMDAwMDAxNjQgMDAwMDAgbiAKMDAwMDAwMDQ4MiAwMDAwMCBuIAowMDAwMDAwNTI3IDAwMDAwIG4gCnRyYWlsZXIKPDwvU2l6ZSA3L1Jvb3QgNSAwIFIvSW5mbyA2IDAgUi9JRCBbPDU4YWIxNmIyMjljMDYxMzdjYThjMzZhMjY0ZDY1ZmUzPjw3ZTBjMjAxZDQyYWJiYTQ1ZDVjNmMyOTYzMmFlNzNlMj5dPj4Kc3RhcnR4cmVmCjY2MgolJUVPRgo)

You are reading the raw bytes of a PDF file and passing it to a RichTextBox[^]. This will not work as the two are not directly compatible. You need to use iTextSharp (or similar) to read the data content of the PDF file, and present it in a form acceptable to the RichtextBox.